subtract 10%iles      0.00000    0.0156772    0.0983472     0.186466
     0.299012     0.462613     0.715927      1.15476      2.13971
diff 10%iles    -0.456222    -0.195501   -0.0850372   -0.0195500      0.00000
    0.0162144    0.0794379     0.188141     0.446712
stardiff 10%iles   -0.0670335   -0.0253320  -0.00833547      0.00000
  4.03970e-05   0.00885762    0.0198300    0.0367691    0.0754557
stardiff contour -excluded 0.005   -0.0670335    0.0754557